EP0600193B1 - Procédé de diffusion de données numériques, notamment pour la radiodiffusion à haut débit vers des mobiles, à entrelacement temps-fréquence - Google Patents

Procédé de diffusion de données numériques, notamment pour la radiodiffusion à haut débit vers des mobiles, à entrelacement temps-fréquence Download PDF

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Publication number
EP0600193B1
EP0600193B1 EP93116353A EP93116353A EP0600193B1 EP 0600193 B1 EP0600193 B1 EP 0600193B1 EP 93116353 A EP93116353 A EP 93116353A EP 93116353 A EP93116353 A EP 93116353A EP 0600193 B1 EP0600193 B1 EP 0600193B1
Authority
EP
European Patent Office
Prior art keywords
interleaving
digital
elements
frequency
function
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93116353A
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German (de)
English (en)
French (fr)
Other versions
EP0600193A3 (en
EP0600193A2 (fr
Inventor
Daniel Pommier
Bernard Le Floch
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telediffusion de France ets Public de Diffusion
Orange SA
Original Assignee
Telediffusion de France ets Public de Diffusion
France Telecom SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
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Application filed by Telediffusion de France ets Public de Diffusion, France Telecom SA filed Critical Telediffusion de France ets Public de Diffusion
Publication of EP0600193A2 publication Critical patent/EP0600193A2/fr
Publication of EP0600193A3 publication Critical patent/EP0600193A3/fr
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H20/00—Arrangements for broadcast or for distribution combined with broadcast
    • H04H20/53—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers
    • H04H20/57—Arrangements specially adapted for specific applications, e.g. for traffic information or for mobile receivers for mobile receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H60/00—Arrangements for broadcast applications with a direct linking to broadcast information or broadcast space-time; Broadcast-related systems
    • H04H60/02—Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linking to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information
    • H04H60/07—Arrangements for generating broadcast information; Arrangements for generating broadcast-related information with a direct linking to broadcast information or to broadcast space-time; Arrangements for simultaneous generation of broadcast information and broadcast-related information characterised by processes or methods for the generation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • H04J3/0602—Systems characterised by the synchronising information used
    • H04J3/0614—Systems characterised by the synchronising information used the synchronising signal being characterised by the amplitude, duration or polarity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
    • H04L1/0056—Systems characterized by the type of code used
    • H04L1/0071—Use of interleaving
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2681—Details of algorithms characterised by constraints
    • H04L27/2688—Resistance to perturbation, e.g. noise, interference or fading
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/023—Multiplexing of multicarrier modulation signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04H—BROADCAST COMMUNICATION
    • H04H2201/00—Aspects of broadcast communication
    • H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
    • H04H2201/20—Aspects of broadcast communication characterised by the type of broadcast system digital audio broadcasting [DAB]

Definitions

  • the field of the invention is that of the dissemination of digital data intended to be received in particular by mobiles circulating in urban areas, that is to say in the presence of parasites and interference, and under conditions of multi-propagation (RAYLEIGH process) generating a phenomenon fading.
  • the invention applies more particularly, but not exclusively, to digital sound broadcasting system as described in document WO-A-88 00 417 the name of the same depositors.
  • the digital broadcasting system presented in this earlier patent application is based on the joint use of a device channel coding, and a method of modulation by frequency multiplexing orthogonal (COFDM system: Coding Orthogonal Frequency Division Multiplex).
  • the actual modulation process of this known system consists ensuring the distribution of digital elements constituting the data signal in frequency-time space f-t and simultaneously emitting sets of elements digital on M parallel broadcasting channels by means of a multiplex of orthogonal carrier frequencies.
  • This type of modulation prevents two successive elements of the data stream are transmitted at the same frequency. This absorbs the fluctuating frequency selectivity of the channel, by dispersing frequently during the broadcast, the digital elements initially adjacent.
  • the known coding process for its part, aims to process the samples from the demodulator to absorb the amplitude variation effect of the received signal, due to the Rayleigh process.
  • the coding is advantageously a convolutional coding, possibly concatenated to a coding of the REED-SOLOMON type.
  • the coded digital elements are moreover interlaced, both in time and in frequency, so as to maximize the statistical independence of samples vis-à-vis the Rayleigh process and the selective nature of the channel.
  • the object of the present invention is to provide an embodiment optimized the frame structure of the broadcast signal, so as to benefit the maximum of the self-synchronization properties of the COFDM process, and maximize the resistance of the system to impulse noise and interference.
  • said symbols are formed from a frequency interleaving using a deterministic function reversible, said function consisting of a method of mixing indices of said frequencies, with maximization of the dispersion of the frequencies associated with adjacent digital elements of the source data signal.
  • Said brewing advantage is to apply a function of the inversion type bit on said binary coded indices.
  • the frequency interleaving thus defined is advantageously combined with a time interleaving performed by applying delays whose value is assigned to each digital element by applying a reversible function of the index of the digital element, the delay function (F) being such that the deinterlacing, in the initial order, and retrieving each element of the source sequence are made by application, to each digital element of same index in the received sequence, of a complementary delay value by relative to the maximum interleaving depth of the delay function.
  • the method is of the type implementing a convolutional coding of the data at the transmitter, and a soft decision decoding by maximizing likelihood at the receiver; characterized in that said correction and / or cancellation processing of the useful signal received for said scrambled frequencies detected consists in informing said soft decision making by means of the noise power detected on each of said frequencies.
  • one objective can be for example to transmit sixteen programs stereophonic in an 8 MHz wide frequency band, with a bit rate digital of the order of 100 kbits (after compression).
  • Each of the N (16) channels C 0 to C n-1 undergoes in parallel a coding 10, then a time-frequency interleaving 11 on a separate channel, before being collectively subjected to a process 12 of time multiplexing and OFDM modulation .
  • the coding 10 is advantageously of the convolutional type. Intertwining time-frequency 11 aims to mix the digital elements of each channel to give them maximum independence from parasites and interference to the broadcast channel 13.
  • OFDM modulation consists in modulating symbols each consisting of a multiplex of orthogonal frequencies broadcast simultaneously on J channels. This operation can be carried out by a Fourier transformation on the coded and interleaved digital sequence of each channel C i .
  • the reception chain includes the steps of channel selection 14, demodulation 15, frequency deinterlacing 16 and decoding 17 of the channel deinterlaced.
  • Operation 14 of channel selection is advantageously carried out by rapid Fourier transformation TFR so as to decimate the set of carriers adequately interleaved to not apply the OFDM demodulation operation only on the carriers of the selected channel (see addition certificate 86 13271 already cited).
  • TFR rapid Fourier transformation
  • the data frame as broadcast through channel 13 presents according to the invention the structure of FIG. 2.
  • the frame consists of a header 21, and of N elementary channels 22 denoted by C 0 to C n-1 each made up of K symbols 23, denoted S 0 to S k-1 .
  • Each symbol 23 is constituted by a multiplex of J orthogonal carriers.
  • Each channel Ci represents a particular data stream, independent of the information transmitted on the other channels.
  • the header 21 of the frame has an "empty" or “blank” interval 24 which serves advantageously both to perform analog synchronization of the frame, and to extract the interference from the broadcast channel.
  • a guard interval is advantageously provided between each symbol of the frame, in order to absorb these echo effects, and to limit the phenomenon of intersymbol interference.
  • the interval guard value is typically 16 ⁇ s, reducing the symbol period useful at 64 ⁇ s.
  • the frame structure produced according to the invention results from a double time interleaving and frequency interleaving of the sequence source (fig. 4).
  • the number of binary elements per channel of the same frame occurring at the input of the interleaving system depends on the number J of carriers per symbol, the number K of symbols per channel and the number of states of the applied modulation to each carrier.
  • the size of the blocks P l of data appearing at each frame at the input of this system is 2.JK bits (l designating the index of the frame).
  • FIG. 5 An example of scalable temporal interleaving is shown in FIG. 5.
  • the block P l is interleaved in accordance with the diagram in FIG. 5 so as to form a block Q l .
  • the double switch 51, 52 symbolizes the application of the interleaving function by successive switching on each of the delay blocks 53.
  • q l-1 be the th element of the block Q l .
  • q l-1 p l - R (i / 16) , i
  • the interleaving depth is therefore 16 frames.
  • the block Q l is split into K packets of 2J bits according to the increasing order of the index i and these packets are assigned to the K symbols of the channel considered, according to the following principle:
  • Frequency interleaving involves assigning the 2J bits of each packet to the carriers carrying the symbol associated with the package considered. These 2J bits are grouped into J pairs which are bijectively associated with the carriers of the symbol, according to the particular law that defines interlacing.
  • (u j, k , v j, k ) denotes the pair of binary elements determining the phase of the carrier fj of the symbol of order k. (Each carrier undergoes 4 phase state modulation).
  • each of the pairs of binary elements is made up of from the source sequence of digital elements by constituting packets of 2M of constituent elements in said sequence, and by combining the two elements two in each pack according to a criterion of maximization of dispersion of adjacent digital elements of the source sequence.
  • Couples of elements numbers are made up by splitting each data packet in half half packets and matching the numerical elements of the same rank in each half pack.
  • An essential characteristic of the invention is that provided that the functions F of temporal interleaving and G of frequency interleaving are suitably chosen with respect to each other, the deinterlacing operation is carried out implicitly by application of the combined function (GoF) -1 .
  • the reconstruction of the blocks Q l is then very simple in the deinterlacing module using the bijective character of the frequency interleaving. Since the receiver uses differential demodulation, the data is restored without problem of phase ambiguity.
  • the principle of the temporal deinterlacing 45 consists in applying to the binary elements of each block Q l the complementary delay with respect to the depth of the interleaving of the delay suffered on transmission. Knowledge of this complementary delay is expressed by mf (i) -1, and is deduced directly from the index i of the binary element and from the a priori knowledge of the function f (.). No synchronization other than that of the multiplex itself is necessary to perform the deinterlacing.
  • the deinterlacing actually applies not to binary elements, but to words (usually 4 bits) representing the estimation by the demodulator bits received.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Error Detection And Correction (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Noise Elimination (AREA)
  • Circuits Of Receivers In General (AREA)
EP93116353A 1988-11-18 1989-11-17 Procédé de diffusion de données numériques, notamment pour la radiodiffusion à haut débit vers des mobiles, à entrelacement temps-fréquence Expired - Lifetime EP0600193B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR8815216 1988-11-18
FR8815216A FR2639495B1 (fr) 1988-11-18 1988-11-18 Procede de diffusion de donnees numeriques, notamment pour la radiodiffusion a haut debit vers des mobiles, a entrelacement temps-frequence et synchronisation analogique
EP89460041A EP0369917B1 (fr) 1988-11-18 1989-11-17 Procédé de diffusion de données numériques, notamment pour la radiodiffusion à haut débit vers des mobiles à entrelacements tempsfréquence et synchronisation analogique

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP89460041.0 Division 1989-11-17
EP89460041A Division EP0369917B1 (fr) 1988-11-18 1989-11-17 Procédé de diffusion de données numériques, notamment pour la radiodiffusion à haut débit vers des mobiles à entrelacements tempsfréquence et synchronisation analogique

Publications (3)

Publication Number Publication Date
EP0600193A2 EP0600193A2 (fr) 1994-06-08
EP0600193A3 EP0600193A3 (en) 1994-07-20
EP0600193B1 true EP0600193B1 (fr) 1999-05-12

Family

ID=9372121

Family Applications (2)

Application Number Title Priority Date Filing Date
EP93116353A Expired - Lifetime EP0600193B1 (fr) 1988-11-18 1989-11-17 Procédé de diffusion de données numériques, notamment pour la radiodiffusion à haut débit vers des mobiles, à entrelacement temps-fréquence
EP89460041A Expired - Lifetime EP0369917B1 (fr) 1988-11-18 1989-11-17 Procédé de diffusion de données numériques, notamment pour la radiodiffusion à haut débit vers des mobiles à entrelacements tempsfréquence et synchronisation analogique

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP89460041A Expired - Lifetime EP0369917B1 (fr) 1988-11-18 1989-11-17 Procédé de diffusion de données numériques, notamment pour la radiodiffusion à haut débit vers des mobiles à entrelacements tempsfréquence et synchronisation analogique

Country Status (4)

Country Link
EP (2) EP0600193B1 (es)
DE (2) DE68928995T2 (es)
ES (2) ES2131087T3 (es)
FR (1) FR2639495B1 (es)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2670969B1 (fr) * 1990-12-19 1993-04-16 France Etat Systeme de transmission de donnees par repartition dans l'espace temps-frequence, avec structuration en canaux.
FR2671923B1 (fr) * 1991-01-17 1993-04-16 France Etat Dispositif de demodulation coherente de donnees numeriques entrelacees en temps et en frequence, a estimation de la reponse frequentielle du canal de transmission et seuillage, et emetteur correspondant.
DE4128713A1 (de) * 1991-08-29 1993-03-04 Daimler Benz Ag Verfahren und anordnung zur messung der traegerfrequenzablage in einem mehrkanaluebertragungssystem
DE4138770A1 (de) * 1991-11-26 1993-05-27 Daimler Benz Ag Verfahren zur digitalen datenuebertragung im nullsymbol des cofdm-modulationsverfahrens
FR2690029B1 (fr) * 1992-04-08 1995-03-31 France Telecom Procédé de transmission de données numériques de radiomessagerie, et récepteur de radiomessagerie correspondant.
EP0578313B1 (fr) * 1992-07-08 1998-12-02 Laboratoires D'electronique Philips S.A.S. Codage enchaíné, pour la transmission OFDM
GB9219466D0 (en) * 1992-09-15 1992-10-28 British Broadcasting Corp Radio transmission systems
DE69434306T2 (de) * 1993-01-20 2005-11-10 Koninklijke Philips Electronics N.V. Verfahren zur Abtrennung einer Blockfrequenz aus einem blockformattierten Signal
FR2702110B1 (fr) * 1993-02-22 1995-06-30 France Telecom Procede de controle automatique de frequence pour la reception de signaux multiporteuses, et recepteur correspondant.
DE69424706T2 (de) * 1993-03-17 2001-01-11 Koninklijke Philips Electronics N.V., Eindhoven Empfänger für differenziel kodierte PSK Signale
US5450456A (en) * 1993-11-12 1995-09-12 Daimler Benz Ag Method and arrangement for measuring the carrier frequency deviation in a multi-channel transmission system
DE4405752C1 (de) * 1994-02-23 1994-08-25 Grundig Emv Verfahren und Schaltungsanordnung zur digitalen Rahmensynchronisation
FI96372C (fi) * 1994-06-16 1996-06-10 Nokia Technology Gmbh Kehystahdistus digitaalisia radiolähetyksiä vastaanottavassa laitteessa
DE4425713C1 (de) * 1994-07-20 1995-04-20 Inst Rundfunktechnik Gmbh Verfahren zur Vielträger Modulation und Demodulation von digital codierten Daten
FR2742613B1 (fr) * 1995-12-14 1998-01-30 France Telecom Procede d'evaluation d'un facteur de qualite representatif d'un canal de transmission d'un signal numerique, et recepteur correspondant
DE19639309B4 (de) * 1996-09-25 2013-12-05 Rohde & Schwarz Gmbh & Co. Kg Verfahren zum Bestimmen der zeitlichen Lage einer Synchronisationsfolge in einem empfangenen Datenstrom mittels Rahmensynchronisation
FR2757725B1 (fr) * 1996-12-20 2001-10-05 Thomson Csf Procede hierarchique de transmission et de radiodiffusion numerique d'emission radiophoniques
DE19933535A1 (de) * 1999-07-16 2001-01-25 Polytrax Inf Technology Ag Synchronisationsverfahren zur Datenübertragung

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL87566C (es) * 1950-05-18
FR1443881A (fr) * 1963-10-15 1966-07-01 Telefunken Patent Procédé de transmission d'informations
FR2604316B2 (fr) * 1986-07-02 1989-05-05 France Etat Procede et installation de communication de donnees numeriques vers des mobiles

Also Published As

Publication number Publication date
ES2131087T3 (es) 1999-07-16
EP0369917A2 (fr) 1990-05-23
DE68928995D1 (de) 1999-06-17
FR2639495B1 (fr) 1993-12-17
EP0600193A3 (en) 1994-07-20
EP0369917A3 (en) 1990-11-28
EP0369917B1 (fr) 1995-02-22
DE68921299T2 (de) 1995-09-21
FR2639495A1 (fr) 1990-05-25
EP0600193A2 (fr) 1994-06-08
DE68928995T2 (de) 2000-01-13
DE68921299D1 (de) 1995-03-30
ES2069605T3 (es) 1995-05-16

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